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  • 【翻译 windbg 6】NET 调试示例实验 1:挂起

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    NET 调试示例实验 1:挂起

    原文

    http://blogs.msdn.com/tess/archive/2008/02/04/net-debugging-demos-lab-1-hang.aspx

    作者

    tess

    翻译

    AloneSword

    译文

    http://blog.csdn.net/alonesword/

    NET 调试实验室 1 :挂起

    这是关于NET 调试实验的10个当中一个。实验中将使用BuggyBits作为站点名称,而且实验名称建议采用 Buggy

    安装信息可以在此处获取。

    可以预测:这些动手实验室当中会有很多问题,虽然我会尽量回答在评论中提到的问题,但是不能保证是所有的内容。如果您能回答评论中的问题,请不要吝啬您的答案。提问题前,请确保已执行过安装指南中所有步骤。

    注意: 实验室中提问(Q:)仅仅是一个问题解决的目标。我会实验复习课程中,编辑评论中关于此问题的答案(每个实验大概会有一周左右的思考时间,这期间是没有答案的)。

    自由的评论实验的格式好坏,以便我能在下次实验内容中知道什么做的好,什么不应该继续。

    将来无约定,这儿就是实验 1

    现象重复

    1、  浏览页面: http://localhost/BuggyBits/FeaturedProducts.aspx
    这个页面大概需要5秒左右时间才能显示,可在页面底端的看到页面开始时间和执行时间。

    2、  同时打开5个浏览器窗口,浏览上述网页
    注意尽量做到同时打开这些网页(否则可能是没有执行reg文件)

    Q:  什么是执行时间?

    Q:  什么是 w3wp.exe CPU使用率?高低标准?

    Q:  系统挂起的潜在原因?

    获取内存转储:

    1、  开启命令行窗口并定位到调试目录中,键入如下命令(不要按回车键):
    adplus -hang -pn w3wp.exe -quiet

    2、  利用上述的同时打开5个窗口 tinyget 进行压力测试站点,以便重复问题
    tinyget -srv:localhost -uri:/BuggyBits/FeaturedProducts.aspx -threads:30 -loop:50

    3、  执行第2步中的方法时,在命令窗口中按下回车键,以获得内存快照信息。

    Q:当使用 adplus hang 模式时,如何触动内存快照?

    Q:获取内存快照时,需要怎样的权限呢?

    Q:转储文件存储的位置?提示:查看windbg帮助中关于adplus/hang 模式的内容

    windbg.exe 中打开转储文件

    1、  打开windbg,选择文件->打开,打开转储的 *.dmp 文件;

    2、  设置符号文件路径(查看 安装指南和信息 获取更多的内容)

    3、  加载 sos (查看 安装指南和信息 获取更多的内容)

    检查堆栈信息:

    1、  检查本地的堆栈信息:
    ~* kb 2000

    2、  检查 dotnet 堆栈信息:
    ~* e!clrstack

    QDo you see any patterns or recognize any of the callstacks that suggests a thread is waiting for a synchronization mechanism?

    跟踪诊断挂起现象:

    1、  检查等待锁的线程ID
    !syncblk

    0:000> !syncblk

    Index SyncBlock MonitorHeld Recursion Owning Thread Info  SyncBlock Owner

       26 0018e4b4           19         1 001edef0   d3c  15   0160f440 System.Object

    -----------------------------

    Q:那个线程拥有锁?

    Q:有多少线程正等待锁?(提示:MonitorHeld = 1 代表拥有者,2为等待者)

    2、  挑选任何一个等待者(提示:等待线程用 AwareLock::Enter 标示),查看当前正在执行的任务;

    ~5s         (切换到线程 5,用真实的线程ID替换5即可)
    kb 2000  
    (检查本地堆栈信息)
    !clrstack  
    (查看dotnet 堆栈信息)

    0:000> ~19s

    eax=77e56bf0 ebx=00000000 ecx=7c99c0d8 edx=7c939b3f esi=00153080 edi=00153124

    eip=7c92eb94 esp=0468fe1c ebp=0468ff80 iopl=0         nv up ei pl zr na pe nc

    cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000246

    ntdll!KiFastSystemCallRet:

    7c92eb94 c3              ret

    0:019> kb 2000

    ChildEBP RetAddr  Args to Child             

    WARNING: Stack unwind information not available. Following frames may be wrong.

    0468ff80 77e56c22 0468ffa8 77e56a3b 00153080 ntdll!KiFastSystemCallRet

    0468ff88 77e56a3b 00153080 0021fac8 0121fac8 rpcrt4!I_RpcBCacheFree+0x5ea

    0468ffa8 77e56c0a 0015c008 0468ffec 7c80b50b rpcrt4!I_RpcBCacheFree+0x403

    0468ffb4 7c80b50b 001e5598 0021fac8 0121fac8 rpcrt4!I_RpcBCacheFree+0x5d2

    0468ffec 00000000 77e56bf0 001e5598 00000000 kernel32!GetModuleFileNameA+0x1b4

    0:019> !clrstack

    OS Thread Id: 0xf08 (19)

    Unable to walk the managed stack. The current thread is likely not a

    managed thread. You can run !threads to get a list of managed threads in

    the process

    Q:如何知道那个 dotnet 方法在等待锁?

    3、  检查拥有者线程执行的内容:

     

    ~5s         (切换到线程 5,用真实的线程ID替换5即可)
    kb 2000  
    (检查本地堆栈信息)
    !clrstack  
    (查看dotnet 堆栈信息)

    Q:为什么会阻塞?

    4、  检查dotnet代码中的对应的方法,以验证我们的猜想。

    提示:

    但愿如下文章对诊断挂起问题有作用:

    Things to ignore when debugging an ASP.NET Hang - Update for .NET 2.0

    A Hang Scenario, Locks and Critical Sections

    .NET Hang Debugging Walkthrough

    Automated .NET Hang Analysis

     

    调试愉快!

    /Tess

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  • 原文地址:https://www.cnblogs.com/AloneSword/p/2237522.html
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